Internal powder feeding type high-energy plasma spraying manufacturing method of refractory metal heavy load wear-proof coating

A technology of high-energy plasma and refractory metal, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems that affect the service life of metal parts, aggravate the wear of coated parts, and plow the surface of the counterpart , to achieve the effects of shortening the hardness difference, denser coating and strong crack growth resistance

Inactive Publication Date: 2019-03-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the hardness of the counter parts worn against these high-hardness wear-resistant coatings is low, the high hardness becomes a disadvantage instead. During the friction process, when the hard phase of the coating falls off and participates in the friction, three-body wear will be formed, which aggravates the The wear of the coated parts will cause severe plowing and scratches on the surface of the counter parts, which will affect the service life of the metal parts to a certain extent

Method used

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  • Internal powder feeding type high-energy plasma spraying manufacturing method of refractory metal heavy load wear-proof coating
  • Internal powder feeding type high-energy plasma spraying manufacturing method of refractory metal heavy load wear-proof coating
  • Internal powder feeding type high-energy plasma spraying manufacturing method of refractory metal heavy load wear-proof coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, 20Cr13 martensitic stainless steel discs are used as the substrate, the size is Φ43×5mm, and the mass percentages are: 0.16 to 0.25% of C, ≤1.0% of Si, ≤1.0% of Mn, ≤0.035% of P, ≤ 0.03 of S, ≤0.6 of Ni, 12-14% of Cr and the balance of Fe.

[0038] The coating is a high wear-resistant coating with a thickness of 300 μm on the surface of the stainless steel disc, and the coating material is Mo metal powder.

[0039] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0040] The specific implementation steps for preparing a high wear-resistant coating on the surface of stainless steel discs by using the internal powder-feeding high-energy plasma spraying method are as follows:

[0041] 1) Substrate surface pretreatment

[0042] The surface of the stainless steel wafer as the substrate is first degreased, decontaminated, polished and derusted...

Embodiment 2

[0047] In this embodiment, the material of the ball valve core is 40Cr13 martensitic stainless steel as the matrix, the size is Φ43×5mm, and the mass percentages are: 0.36-0.45% C, ≤0.6% Si, ≤0.80% Mn, ≤0.035% P of ≤0.03%, S of ≤0.6%, Ni of ≤0.6%, Cr of 12~14%, and the balance is Fe.

[0048] The coating is a high wear-resistant coating with a thickness range of 350 μm on the surface of the ball valve, and the coating material is Mo metal powder.

[0049] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0050] The specific implementation steps for preparing the high wear-resistant coating on the surface of the valve core sphere by using the internal powder-feeding high-energy plasma spraying method are as follows:

[0051] 1) Substrate surface pretreatment

[0052] The surface of the spool sphere as the base material is first degreased, decontaminated, polished a...

Embodiment 3

[0057] In this embodiment, the gear material of the automobile gearbox is 20CrMnTi carburized steel as the matrix, the size is Φ43×5mm, and the mass percentages are: 0.17~0.23% of C, 0.17~0.37% of Si, 0.8~1.1% of Mn, ≤0.03 % of P, ≤0.03% of S, ≤0.04% of Ti, ≤0.03% of Cu, ≤0.03% of Ni, 1.0-1.3% of Cr and the balance being Fe.

[0058] The coating is a high wear-resistant coating with a thickness range of 380 μm on the gear surface, and the coating material is Mo metal powder.

[0059] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0060] The specific implementation steps of preparing the high wear-resistant coating on the surface of the gear by using the internal powder feeding high-energy plasma spraying method are as follows:

[0061] 1) Substrate surface pretreatment

[0062] The surface of the gear as the base material is first degreased, decontaminated, pol...

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Abstract

The invention relates to an internal powder feeding type high-energy plasma spraying manufacturing method of a refractory metal heavy load wear-proof coating. Mo powder is used as the raw material ofthe coating, and the coating is obtained on a metal base material by means of an internal powder feeding type high-energy plasma spraying method. By the adoption of the internal powder feeding type high-energy plasma spraying manufacturing method of the refractory metal heavy load wear-proof coating, by means of reasonable thermal spraying technological parameters, the spraying technological process is strictly controlled, so that the porosity of the coating is reduced, the breaking tenacity of the coating is improved, and the comprehensive mechanical property of the coating is greatly improved; the hardness difference between a coated part and a counterpart is small, three-body wear caused under heavy load conditions is avoided, the friction coefficient and wear rate are lowered, the wearresistance is greatly improved, and the service lives of all types of metal parts are effectively prolonged.

Description

technical field [0001] The invention belongs to the field of metal surface modification, and in particular relates to a method for preparing refractory metal heavy-duty wear-resistant coatings by internal powder-feeding high-energy plasma spraying. Background technique [0002] In the modern industries of aerospace, automobile, metallurgy, machinery, and railway transportation, heavy-duty conditions widely exist in parts such as ball valves, engine main shaft bearings, gearbox gears, and vehicle clutch release rings. The wear form under heavy load conditions is mainly abrasive wear, accompanied by erosion wear, adhesive wear, oxidation and fatigue spalling. Surface modification can improve the wear resistance, corrosion resistance and oxidation resistance of metal parts under heavy load conditions, thereby greatly improving the service life of metal parts. [0003] For the failure of heavy-duty metal parts, commonly used surface modification methods include nitriding, surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/08
CPCC23C4/08C23C4/134
Inventor 白宇柳琪马玉山常占东刘海波何涛
Owner XI AN JIAOTONG UNIV
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